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Excretion from long glandular trichomes contributes to alleviation of cadmium toxicity in Nicotiana tabacum by Hongying Zhang; Xinyong Lu; Zhaojun Wang; Xiaoxiao Yan; Hong Cui is a Environmental Science article available to read on EtoBox.

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The B-type cyclin gene, CycB2, serves as a negative regulator of glandular trichome initiation. Through targeted knockout of NtCycB2 in Nicotiana tabacum cv. K326 using the CRISPR/Cas9 system, we created a variety, HK326, which exhibits significantly increased density and larger glandular heads of long glandular trichomes. Under Cd-stress, HK326 exhibited enhanced Cd tolerance, as demonstrated by a robust root system, strengthened cell membrane stability, and higher photosynthetic parameters. HK326 exhibited enhanced Cd-stress tolerance due to a strong excretion capacity of long glandular trichomes by forming calcium oxalate crystals. Cd mainly accumulated in tobacco shoots rather than remained in roots. Specifically, Cd levels of the HK326 shoot surface were nearly two-fold of those of K326, resulting in less Cd internally in the roots and shoots. Gene expression patterns revealed 11 Cd transporter genes that were upregulated after Cd-stress in shoots, roots, and trichomes. Among them, the NtHMA2 gene encoding heavy metal ATPases and involved in the transport of divalent heavy metal cations was expressed consistently and significantly higher in HK326 than K326, both before and aft

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Author

Hongying Zhang; Xinyong Lu; Zhaojun Wang; Xiaoxiao Yan; Hong Cui

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Environmental Science (Physical Sciences)